UPSTREAM: coresight: etm3: Add support for handling errors

Add support for reporting errors back from the SMP cross
function call for enabling ETM.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Upstream commit e2a1551a881f27d1914f182e06b423cc242b43b6).

Bug: 140266694
Change-Id: I28fa8136586aaa5966f13933df66edf28130fa33
Signed-off-by: Yabin Cui <yabinc@google.com>